Point3 parg_zcam_matrices(Matrix4* proj, Matrix4* view)
{
*proj = M4MakeFromDM4(_projmat);
DPoint3 target = {_camerapos.x, _camerapos.y, 0};
DVector3 up = {0, 1, 0};
*view = M4MakeFromDM4(DM4MakeLookAt(_camerapos, target, up));
return (Point3){_camerapos.x, _camerapos.y, _camerapos.z};
}
void draw()
{
DMatrix4 view, projection;
parg_zcam_dmatrices(&projection, &view);
DMatrix4 model = DM4MakeTranslation((DVector3){-0.5, -0.5, -1});
Matrix4 mvp = M4MakeFromDM4(DM4Mul(projection, DM4Mul(view, model)));
const Vector4 BLACK = {0, 0, 0, 1};
Vector2 mapsize = {1, 1};
parg_aar rect = parg_zcam_get_rectangle();
parg_tilerange tiles;
float slippyfract = parg_aar_to_tilerange(rect, mapsize, &tiles);
parg_aar slippyaar = parg_aar_from_tilename(tiles.mintile, mapsize);
Vector4* slippybox = (Vector4*) &slippyaar;
slippybox->z = 1.0 / (slippybox->z - slippybox->x);
slippybox->w = 1.0 / (slippybox->w - slippybox->y);
parg_draw_clear();
parg_shader_bind(P_OCEAN);
parg_uniform_matrix4f(U_MVP, &mvp);
parg_uniform1i(U_SHOWGRID, showgrid);
parg_uniform4f(U_SLIPPYBOX, slippybox);
parg_uniform1f(U_SLIPPYFRACT, slippyfract);
parg_texture_bind(ocean_texture, 0);
parg_varray_bind(parg_mesh_index(ocean_mesh));
parg_varray_enable(
parg_mesh_coord(ocean_mesh), A_POSITION, 3, PARG_FLOAT, 0, 0);
parg_draw_triangles_u16(0, parg_mesh_ntriangles(ocean_mesh));
parg_shader_bind(P_SOLID);
parg_uniform_matrix4f(U_MVP, &mvp);
parg_uniform4f(U_COLOR, &BLACK);
parg_varray_bind(parg_mesh_index(landmass_mesh));
parg_varray_enable(
parg_mesh_coord(landmass_mesh), A_POSITION, 3, PARG_FLOAT, 0, 0);
parg_draw_wireframe_triangles_u16(0, parg_mesh_ntriangles(landmass_mesh));
if (mode_highp) {
float x = parg_aar_width(rect) / fbsize.x;
float y = parg_aar_height(rect) / fbsize.y;
slippybox->z *= x;
slippybox->w *= y;
slippybox->x = (slippybox->x - rect.left) / x;
slippybox->y = (slippybox->y - rect.bottom) / y;
}
parg_shader_bind(mode_highp ? P_LANDMASS_FRAGCOORD : P_LANDMASS);
parg_uniform_matrix4f(U_MVP, &mvp);
parg_uniform1i(U_SHOWGRID, showgrid);
parg_uniform4f(U_SLIPPYBOX, slippybox);
parg_uniform1f(U_SLIPPYFRACT, slippyfract);
parg_texture_bind(paper_texture, 0);
parg_draw_triangles_u16(0, parg_mesh_ntriangles(landmass_mesh));
}
void parg_zcam_highprec(Matrix4* vp, Point3* eyepos_lo, Point3* eyepos_hi)
{
DPoint3 origin = {0, 0, 0};
DPoint3 target = {0, 0, -1};
DVector3 up = {0, 1, 0};
DMatrix4 view = DM4MakeLookAt(origin, target, up);
if (vp) {
*vp = M4MakeFromDM4(DM4Mul(_projmat, view));
}
Point3 eyepos = P3MakeFromDP3(_camerapos);
DPoint3 deyepos = DP3MakeFromP3(eyepos);
DVector3 difference = DP3Sub(_camerapos, deyepos);
if (eyepos_lo) {
*eyepos_lo = P3MakeFromV3(V3MakeFromDV3(difference));
}
*eyepos_hi = eyepos;
}
